Nissan Leaf. Manual — part 1140
PRECAUTIONS
STC-5
< PRECAUTION >
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- Check connection conditions of each connector are proper.
- Before connecting or disconnecting the EPS control unit harness
connector, turn power switch “OFF” and disconnect 12V battery
ground cable. Because battery voltage is applied to EPS control
unit even if power switch is turned “OFF”. Refer to
tion for Removing 12V Battery"
- When connecting or disconnecting pin connectors into or from
EPS control unit, take care not to damage pin terminals (bend or
break).
- When connecting pin connectors, make sure that there are no
bends or breaks on EPS control unit pin terminal.
• During quick steering, rasping noise may be heard from around the
steering wheel. This is not a malfunction. The noise is an operating
noise of the EPS system under normal conditions. If the rasping
noise occurs during slow steering, this may not be an operating
noise of the system. In this case, it is necessary to find out the
location of the noise and repair, if necessary.
SEF289H
SEF291H
STC-6
< SYSTEM DESCRIPTION >
COMPONENT PARTS
SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000010119179
A.
Steering column assembly
No.
Component
Function
1.
VCM (Vehicle Control Module)
• Transmits mainly the following signals to EPS control unit via CAN communication.
- Power steering start activation request signal
Refer to
EVC-15, "Component Parts Location"
for detailed installation location.
2.
ABS actuator and electric unit (con-
trol unit)
• Transmits mainly the following signal to EPS control unit via CAN communication.
- Vehicle speed signal
Refer to
BRC-10, "Component Parts Location"
for detailed installation location.
3.
Combination meter
• Transmits mainly the following signal to EPS control unit via CAN communication.
- Vehicle speed signal
Refer to
MWI-6, "METER SYSTEM : Component Parts Location"
lation location.
• Turns ON the EPS warning lamp according to the signal from EPS control unit via
CAN communication.
4.
EPS warning lamp
STC-8, "EPS SYSTEM : System Description"
5.
EPS motor
STC-7, "EPS Motor, Torque Sensor, Reduction Gear"
6.
EPS control unit
7.
Reduction gear
STC-7, "EPS Motor, Torque Sensor, Reduction Gear"
8.
Torque sensor
STC-7, "EPS Motor, Torque Sensor, Reduction Gear"
JSGIA0847GB
COMPONENT PARTS
STC-7
< SYSTEM DESCRIPTION >
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EPS Control Unit
INFOID:0000000010119180
• EPS control unit (1) is installed to steering column assembly.
• EPS control unit performs an arithmetical operation on data, such
as steering wheel turning force (sensor signal) from the torque
sensor, vehicle speed signal, etc. Then it generates an optimum
assist torque signal to the EPS motor according to the driving con-
dition.
• EPS control unit decreases the output signal to EPS motor while
extremely using the power steering function (e.g., full steering)
consecutively for protecting EPS motor and EPS control unit
(Overload protection control).
EPS Motor, Torque Sensor, Reduction Gear
INFOID:0000000010119181
EPS motor (1), torque sensor (2) and reduction gear (3) are installed
to steering column assembly.
EPS MOTOR
EPS motor provides the assist torque by the control signal from EPS control unit.
TORQUE SENSOR
Torque sensor detects the steering torque, and transmits the signal to EPS control unit.
REDUCTION GEAR
Reduction gear increases the assist torque provided from EPS motor with worm gears, and outputs to the col-
umn shaft.
JSGIA0852ZZ
JSGIA0853ZZ
STC-8
< SYSTEM DESCRIPTION >
SYSTEM
SYSTEM
EPS SYSTEM
EPS SYSTEM : System Description
INFOID:0000000010119182
SYSTEM DIAGRAM
DESCRIPTION
• EPS control unit performs an arithmetical operation on data, such
as steering wheel turning force (sensor signal) from the torque
sensor, vehicle speed signal, etc. Then it generates an optimum
assist torque signal to the EPS motor according to the driving con-
dition.
• In case of an error in the electrical system, the fail-safe function
stops output signals to the EPS motor. Refer to
• EPS control unit decreases the output signal to EPS motor while
extremely using the power steering function (e.g., full steering)
consecutively for protecting EPS motor and EPS control unit
(Overload protection control). Refer to
• Extensive steering at low speed will cause the EPS control unit
and EPS motor to heat up, once temperature reaches critical point
EPS control unit will reduce current to reduce heat up. System will
recover as temperature lowers (reduced or no assistance).
EPS WARNING LAMP INDICATION
• Turn ON when there is a malfunction in EPS system. If indicates that fail-safe mode is engaged and enters a
manual steering state (Control turning force steering wheel becomes heavy).
• Also turns ON when power switch is turned ON, for purpose of lamp check. Turns OFF after the vehicle is
READY state, if system is normal.
JSGIA1000GB
JSGIA1001GB
Condition
EPS warning lamp
Power switch ON (Lamp check)
ON
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